package com.easy.util;

import cn.hutool.crypto.digest.DigestUtil;

public class PasswordUtil {

    private final static  char[] arr = {
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
            'a', 'b', 'c', 'd', 'e', 'f'
    };
    //前面小后面大
    private final static  int salt_index=5;
    private final static  int count_index=15;
    public static String getEncryption(String password) {
        //随机盐值
        int index_salt=(int)(Math.random()*arr.length);
        char salt=arr[index_salt];
        //随机加密次数
        int index_count=(int)(Math.random()*arr.length);
        char count=arr[index_count];
        String encryptionPassword=password+salt;
        for (int i = 0; i < count; i++) {
            encryptionPassword= DigestUtil.md5Hex(encryptionPassword);
        }
        StringBuilder strb=new StringBuilder(encryptionPassword);
        strb.insert(salt_index,salt);
        strb.insert(count_index,count);
        return strb.toString();
    }
    public static boolean checkPassword(String password,String encryptionPassword){
        //盐值
        char salt=encryptionPassword.charAt(salt_index);
        //加密次数
        char count=encryptionPassword.charAt(count_index);
        String decode=password+salt;
        for (int i = 0; i < count; i++) {
            decode= DigestUtil.md5Hex(decode);
        }
        StringBuilder strb=new StringBuilder(decode);
        strb.insert(salt_index,salt);
        strb.insert(count_index,count);

        return strb.toString().equals(encryptionPassword);
    }
    public static void main(String[] args) {
//        System.out.println(getEncryption("123456"));
        System.out.println(checkPassword("123456","b12a8f23a22ad324173c58fb910f0d3713"));
    }
}
